3_Arduino-ESP32_DHT11,步進電機(驅動ic：ULN20003),舵機

1_DHT11

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1.1_DHT11+OLED_I2C_0.96(SSD1306)

下載並把庫放在C:\Program Files (x86)\Arduino\libraries
Adafruit-GFX-Library
Adafruit_SSD1306
Adafruit_Sensor
DHT-sensor-library

SCL=22
SDA=21

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

#define DHTPIN 4 // Digital pin connected to the DHT sensor

// Uncomment the type of sensor in use:
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22 (AM2302)
//#define DHTTYPE DHT21 // DHT 21 (AM2301)

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);

  dht.begin();

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();
  display.setTextColor(WHITE);
}

void loop() {
  delay(5000);

  //read temperature and humidity
  float t = dht.readTemperature();
  float h = dht.readHumidity();
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
  }
  // clear display
  display.clearDisplay();
  
  // display temperature
  display.setTextSize(1);
  display.setCursor(0,0);
  display.print("Temperature: ");
  display.setTextSize(2);
  display.setCursor(0,10);
  display.print(t);
  display.print(" ");
  display.setTextSize(1);
  display.cp437(true);
  display.write(167);
  display.setTextSize(2);
  display.print("C");
  
  // display humidity
  display.setTextSize(1);
  display.setCursor(0, 35);
  display.print("Humidity: ");
  display.setTextSize(2);
  display.setCursor(0, 45);
  display.print(h);
  display.print(" %"); 
  
  display.display(); 
}
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2_步進電機(驅動ic：ULN20003)

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#include <Stepper.h>

#define STEPS 2038 // the number of steps in one revolution of your motor (28BYJ-48)
 
Stepper stepper(STEPS, 2, 4, 5, 15);
  
 void setup() {
 // nothing to do
}

void loop() {
stepper.setSpeed(1); // 1 rpm
stepper.step(2038); // do 2038 steps -- corresponds to one revolution in one minute
delay(1000); // wait for one second
stepper.setSpeed(6); // 6 rpm
stepper.step(-2038); // do 2038 steps in the other direction with faster speed -- corresponds to one revolution in 10 seconds
 }
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3_舵機

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3.1_SG90(0~180)

VCC（紅線） - 5V
SIG（黃色/橙色） - 2
GND（黑色/棕色） - GND

#define COUNT_LOW 0
 #define COUNT_HIGH 8888

 #define TIMER_WIDTH 16

#include "esp32-hal-ledc.h"

void setup() {
   ledcSetup(1, 50, TIMER_WIDTH); // channel 1, 50 Hz, 16-bit width
   ledcAttachPin(2, 1);   
}

void loop() {
   for (int i=COUNT_LOW ; i < COUNT_HIGH ; i=i+100)
   {
      ledcWrite(1, i);       // sweep servo 1
      delay(50);
   }
}
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